I've got the contents of Betrayal at Calth and The Burning of Prospero to get me rolling. The Cataphractii Terminators will most likely become Siege Tyrant Terminators.
Captain Aethon from BaC has become my Warsmith for the time being. Once I get a hold of a Peturabo model I'll most likely make him the sergeant for the Siege Tyrant Terminators. I'm thinking of adding a servo arm to the model.
Painting is done and the build marches on!